diff --git a/ChangeLog.txt b/ChangeLog.txt
index 268278816..9c5a93280 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -659,4 +659,6 @@
 	* apps/examples/cc3000:  Condition the CC3000 example on having
 	  selected the CC3000 device.  Otherwise, you are prompted for
 	  this the CC3000 option on each 'make oldconfig' (2013-9-18).
+	* apps/system/usbmonitor/usbmonitor.c:  Fix some bad conditional
+	  compilation probably introduced on 2013-9-9 (2013-9-23).
 
diff --git a/system/usbmonitor/usbmonitor.c b/system/usbmonitor/usbmonitor.c
index 447bff57b..f223be540 100644
--- a/system/usbmonitor/usbmonitor.c
+++ b/system/usbmonitor/usbmonitor.c
@@ -74,7 +74,7 @@
 
 /* USB device trace selection */
 
-#ifdef USBDEV_TRACE
+#ifdef CONFIG_USBDEV_TRACE
 #  ifdef CONFIG_SYSTEM_USBMONITOR_TRACEINIT
 #    define TRACE_INIT_BITS       (TRACE_INIT_BIT)
 #  else